/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.cmd;

import java.util.Map;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.deploy.DeploymentManager;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.MessageEventSubscriptionEntity;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.runtime.ProcessInstanceBuilderImpl;
import org.activiti.engine.runtime.ProcessInstance;
import org.flowable.engine.repository.ProcessDefinition;

/**
 * @author Daniel Meyer
 * @author Joram Barrez
 * @author Vasile Dirla
 */
public class StartProcessInstanceByMessageCmd implements Command<ProcessInstance> {

    protected final String messageName;
    protected final String businessKey;
    protected final Map<String, Object> processVariables;
    protected Map<String, Object> transientVariables;
    protected final String tenantId;

    public StartProcessInstanceByMessageCmd(String messageName, String businessKey, Map<String, Object> processVariables, String tenantId) {
        this.messageName = messageName;
        this.businessKey = businessKey;
        this.processVariables = processVariables;
        this.tenantId = tenantId;
    }

    public StartProcessInstanceByMessageCmd(ProcessInstanceBuilderImpl processInstanceBuilder) {
        this.messageName = processInstanceBuilder.getMessageName();
        this.businessKey = processInstanceBuilder.getBusinessKey();
        this.processVariables = processInstanceBuilder.getVariables();
        this.transientVariables = processInstanceBuilder.getTransientVariables();
        this.tenantId = processInstanceBuilder.getTenantId();
    }

    @Override
    public ProcessInstance execute(CommandContext commandContext) {

        if (messageName == null) {
            throw new ActivitiIllegalArgumentException("Cannot start process instance by message: message name is null");
        }

        MessageEventSubscriptionEntity messageEventSubscription = commandContext.getEventSubscriptionEntityManager()
                .findMessageStartEventSubscriptionByName(messageName, tenantId);

        if (messageEventSubscription == null) {
            throw new ActivitiObjectNotFoundException("Cannot start process instance by message: no subscription to message with name '" + messageName + "' found.", MessageEventSubscriptionEntity.class);
        }

        String processDefinitionId = messageEventSubscription.getConfiguration();
        if (processDefinitionId == null) {
            throw new ActivitiException("Cannot start process instance by message: subscription to message with name '" + messageName + "' is not a message start event.");
        }

        DeploymentManager deploymentManager = commandContext
                .getProcessEngineConfiguration()
                .getDeploymentManager();

        ProcessDefinitionEntity processDefinition = (ProcessDefinitionEntity) deploymentManager.findDeployedProcessDefinitionById(processDefinitionId);
        if (processDefinition == null) {
            throw new ActivitiObjectNotFoundException("No process definition found for id '" + processDefinitionId + "'", ProcessDefinition.class);
        }

        // Do not start process a process instance if the process definition is suspended
        if (deploymentManager.isProcessDefinitionSuspended(processDefinition.getId())) {
            throw new ActivitiException("Cannot start process instance. Process definition "
                    + processDefinition.getName() + " (id = " + processDefinition.getId() + ") is suspended");
        }

        ActivityImpl startActivity = processDefinition.findActivity(messageEventSubscription.getActivityId());
        ExecutionEntity processInstance = processDefinition.createProcessInstance(businessKey, startActivity);

        if (processVariables != null) {
            processInstance.setVariables(processVariables);
        }
        if (transientVariables != null) {
            processInstance.setTransientVariables(transientVariables);
        }

        processInstance.start();

        return processInstance;
    }

}
